2003 Johnson 115 power loss under load

by Ed
(DesMoines, Ia)

The motor was running at 5500 rpm and suddenly lost power and top rpm was 4000. Had fuel system cleaned and checked and 2 carbs rebuilt. Mechanic stated that the other carbs were working. Even checked the fuel.
When put back in water the motor started and idled great, better than before and when I opened the throttle it responded great and ran better than ever for about an hour and again it lost power and would only run a max of 4000rpm. I shut the motor off and used the kicker motor to fish for an hour or so and when I started the 115 to return to the resort, it would hardly run at any speed for a while and finally the rpm went to 4000 and we returned to the resort. Anythoughts as to what the trouble might be.

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